hey man
As per my knowledge if you want to change the color of radiobutton is quiet not possible.But
i can give you same solution for this one.Just you need to create one movie which is same looks which you want.
which will be looks very simillar to radio button in any color you choose and for checking it and deselecting things
you can create checked radio button in second frame of same movie.

means one movie for first frame it will be unchecked and second frame it is checked one.
and you can write script for select and deselect

In case if you need the values for radiobutton can set variables's value to value of radio button is checked or not.

I would like to throw you some light on why you say that Green button when you dragged a instance of the radio group. Flash MX 2004 UI is controlled by a concept called themes, something similar to Winamp and based on which theme you adopt in your project the color and theme changes. You can alter the default theme so that all your elements have a color scheme based on your requirment or you can take a base theme (defualt is halo) and customize it.

right heres a question that will confuse us?? ive flash mx2004 on my comp at work and its where my radio button are green when i drag them onto the stage, but on my home laptop, in flash mx2004, if i drag them on to the stage, there black and if i use the above code to set the theme etc, everythign works, but just not on my works comp for flash...

I dragged a button onto the stage, clicked the properties tab instead of the parameters tab in the properties panel and pulled the color selection down to "tint" and can assign it whatever color I want. Does no combination of these setting override whatever default is setting yours to green?